COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 727 Series Aeroplanes AD/B727/86 Passenger Oxygen Mask Tube Attachment 4/80 Applicability: All models with "Carry-all" interior passenger service units. Document: 1. Boeing SB No. 727-35-A18; or 2. FAA AD 79-23-02. Compliance: Within 2000 hours time in service after 30 April 1980. Background: Advice from overseas indicates that modification of the passenger oxygen manifold orifice fittings is necessary to prevent passenger oxygen supply tubes from inadvertently disconnecting.